body { margin: 0; font: 17px/1.6 system-ui, -apple-system, "Segoe UI", sans-serif; color: #1f2933; background: #fff; }
main { max-width: 720px; margin: 0 auto; padding: 48px 20px; }
h1 { font-size: 2rem; margin: 0 0 16px; }
h2 { font-size: 1.25rem; margin-top: 32px; }
.lead { font-size: 1.1rem; }
a { color: #1a56db; }
code { font-size: 0.85em; background: #f3f4f6; padding: 1px 4px; border-radius: 4px; word-break: break-all; }
footer { max-width: 720px; margin: 0 auto; padding: 24px 20px 48px; border-top: 1px solid #e5e7eb; color: #6b7280; font-size: 0.9rem; }